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A surface selective coating method for high-nickel ternary materials for lithium-ion batteries

A high-nickel ternary material, lithium-ion battery technology, applied in electrical components, battery electrodes, secondary batteries, etc., can solve the problems of reduced material gram capacity, increased material cost, cumbersome operating procedures, etc., to improve storage performance, The effect of reducing environmental humidity requirements and improving cycle performance

Active Publication Date: 2019-12-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, water washing plus surface coating is a full coating of the surface of the material. Since the coated oxides are basically non-electrochemically active, the gram capacity of the material will be reduced; at the same time, the operation process is relatively cumbersome and the coating A large amount of materials will greatly increase the cost of materials

Method used

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  • A surface selective coating method for high-nickel ternary materials for lithium-ion batteries
  • A surface selective coating method for high-nickel ternary materials for lithium-ion batteries
  • A surface selective coating method for high-nickel ternary materials for lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A surface selective coating method of high-nickel ternary materials for lithium-ion batteries, such as Figure 4 Shown:

[0029] (1) Place the high-nickel ternary material of the lithium-ion battery in a humid environment with an air humidity of 10%-80% for 0.05-10h to generate residual alkali on the corners or edges of the surface;

[0030] (2) Add the high-nickel ternary material treated in step (1) into the ethanol solution of the metal salt, and stir to make the metal ions fully react with the residual alkali on the surface of the high-nickel ternary material. After the reaction is completed, within 60-80 Stir the solution until dry at ℃ to obtain a sample;

[0031] (3) The sample is sintered in a muffle furnace with oxygen or air atmosphere, the sintering temperature is 300-900°C, and the time is 1-10h; lithium metal oxide is formed on the residual alkali part of the high-nickel ternary material to obtain High nickel ternary material coated with lithium metal oxi...

Embodiment 2

[0032] Example 2: Preparation of LiAlO 2 Coated LiNi 0.85 co 0.1 mn 0.05 o 2

[0033] First, the lithium-ion battery high-nickel ternary material (LiNi 0.85 co 0.1 mn 0.05 o 2 ) placed in an environment with a humidity of 30% for 1 hour to generate residual alkali on the corners or edges of the surface;

[0034] Then add it to the ethanol solution of aluminum nitrate, wherein the mass of the Al element accounts for 0.1% of the total mass of the high-nickel ternary material, after stirring at high speed for 2 hours, stir the solution at 60°C until dry;

[0035] Finally, the dried sample was placed in a muffle furnace with an oxygen atmosphere, sintered at 600 °C for 2 h, and then cooled down to room temperature naturally, and lithium metal oxide was formed on the residual alkali part of the high-nickel ternary material for coating.

[0036] Such as figure 1 As shown, the high-nickel ternary material (LiNi 0.85 co 0.1 mn 0.05 o 2 ) placed in an environment with a h...

Embodiment 3

[0039] Example 3: Preparation of LiAlO 2 Coated LiNi 0.85co 0.1 mn 0.05 o 2

[0040] First, the lithium-ion battery high-nickel ternary material (LiNi 0.85 co 0.1 mn 0.05 o 2 ) into N with a humidity of 30% 2 Treat for 0.5 hours to generate residual alkali on the corners or edges of the surface;

[0041] Then add it to the ethanol solution of aluminum nitrate, wherein the mass of the Al element accounts for 0.1% of the total mass of the high-nickel ternary material, after stirring at high speed for 2 hours, stir the solution at 60°C until dry;

[0042] Finally, the dried sample was placed in a muffle furnace with an oxygen atmosphere, sintered at 600 °C for 2 h, and then cooled down to room temperature naturally, and lithium metal oxide was formed on the residual alkali part of the high-nickel ternary material for coating.

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Abstract

The invention discloses a method for selectively coating a surface of a lithium-ion battery high-nickel ternary material. The method comprises the following steps: placing a high-nickel ternary material of a lithium-ion battery in a humid environment so as to produce residual alkali at the corner or edge position of the surface of the material; adding the residual alkali into an ethanol solution of a metal salt, stirring and reacting; and sintering the sample in a muffle furnace, and producing a lithium metal oxide at the residual alkali part of the high-nickel ternary material, thereby obtaining the high-nickel ternary material coated with the lithium metal oxide on the surface. The amount and production position of the residual alkali on the surface of the high-nickel ternary material can be controlled by virtue of water vapor contact time, the residual alkali is reacted with the metal salt, and metal ions are deposited at the residual alkali presence position, so that the selective coating aim is achieved. The coating method disclosed by the invention is simple, the usage amount of the coating material is low, selective coating can be performed at an active site at which the residual alkali is separated out of the high-nickel ternary material, the water absorption capability and electrochemical performance of the material can be well improved, and the method disclosed by the invention has extremely high commercial value.

Description

technical field [0001] The patent of the present invention relates to the technical field of lithium-ion batteries, in particular to a surface selective coating method of high-nickel ternary materials for lithium-ion batteries. Background technique [0002] Due to its high working voltage, energy density, long life and environmental friendliness, lithium-ion batteries have become the power source of a new generation of electric vehicles, electric tools and electronic products, and have been widely used in energy, transportation, communications, etc. in different fields. At the end of 2015, in the "13th Five-Year" new energy vehicle pilot special project issued by the Ministry of Science and Technology, it is required that by 2020, the specific energy of lithium-ion power batteries in my country will reach 300Wh / kg, and even 350Wh / kg. [0003] Ternary materials, especially high-nickel ternary materials, are the current research hotspots, and have been widely used due to thei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 高玉仙杨茂萍陈方李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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